I'll tell you what, Itachi will succeed in getting rid of Edo Tensei and then he will dissapear too. However the fact that earlier Tobi made Kabuto show him how to use Edo Tensei, coupled with the fact that as he is standing there with Itachi Sasuke will also learn the seals of how to undo Edo Tensei means there will be a showdown between Tobi and Sasuke at one point, with the latter disabling the Edo Tensei of the former. And it could be pretty ironic too, as seeing all those Sharingans Tobi keeps he will probably resurrect the entire Uchiha clan forcing Sasuke to banish them back to their graves.
god, fuck you, kishimoto. I wanted to complain about chakra levels being absurd once again (just how long can Tsunade keep up this insta-regen to fight Susanoo?!), but then ... another Uchiha-hax. wow.
Guess now we know how Sasuke will get stronger, too :/
PS: Gaara is boss